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The Magpul MBUS Rear Sight has earned its spot as one of the most popular backup irons on the AR-15 platform, and it's easy to see why. This Gen 2 version is molded from impact-resistant polymer, so it shrugs off knocks, drops, and general range abuse while staying light enough that you'll barely notice it riding on your rail. It clamps to any MIL-STD-1913 Picatinny rail and delivers the same height-over-bore as standard A2 iron sights, so it drops right into your setup without throwing off your sight picture.
You get a dual aperture setup here, with protective wings on both sides guarding the same-plane flip apertures from bumps and grit. Flip between the large and small aperture depending on whether you're running close and fast or reaching out for a more precise shot, and the sight will still fold flat with either one selected. Windage runs off a detent knob that adjusts positively by hand, no tools needed, which is exactly what you want when you're making corrections on the fly.
The spring-loaded design pops up with a quick press from either side or a push on the top, so it's genuinely ambidextrous and quick to bring into action. Detent and spring pressure hold the sight upright under hard use, but it'll still fold out of the way under impact rather than snapping off. Stowed, it sits at roughly 0.51 inches above the rail and tucks in low so it stays clear of your optic and doesn't snag on gear.
This is a smart pairing with red dots and other electronic optics as a co-witness backup, ready to step in the moment your batteries die or your glass takes a hit. It's made in the USA, weighs in at about 1.3 ounces with hardware, and the Flat Dark Earth finish keeps things subdued if you're building around an earth-tone rifle.
Yes, it provides the same height-over-bore as standard A2 iron sights, which makes it a solid backup to co-witness with most red dot optics. It's a popular choice specifically for backing up electronic sights in case the battery dies or the glass gets damaged. You'll want to pair it with an MBUS front sight to complete the setup.
Windage is handled by a detent knob that you turn by hand, so no tools are required. The detents click positively into place and hold your setting during recoil and hard use. That makes on-the-fly corrections quick and easy right at the range.
It clamps to most MIL-STD-1913 Picatinny rails, so it works on plenty of firearms beyond the AR platform. That said, it's specifically tailored to the AR-15/M16/M4 and gives you the correct sight height on those rifles. Keep it on a receiver-mounted rail rather than a railed gas block, since heat can be an issue there.
The impact-resistant polymer is built to shrug off knocks and operational abuse while keeping the sight light. Under a hard hit, it's designed to fold out of the way rather than break, then flip right back up. For a backup sight that lives on your rifle, it holds up to real-world use very well.
| UPC | 873750004365 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG248-FDE |
| Color | Dark Earth |
| Model | |
| Product Type | Rear |
| Shipping Weight | 0.125 |
| Style | Flip-Up |
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